Amplitude demodulation-based EM analysis of different RSA implementations

Authors:
Guilherme Perin;Lionel Torres;Pascal Benoit;Philippe Maurine
Affiliations:
LIRMM, University of Montpellier, Montpellier, France;LIRMM, University of Montpellier, Montpellier, France;LIRMM, University of Montpellier, Montpellier, France;LIRMM, University of Montpellier, Montpellier, France
Venue:
DATE '12 Proceedings of the Conference on Design, Automation and Test in Europe
Year:
2012

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Abstract

This paper presents a fully numeric amplitude-demodulation based technique to enhance simple electromagnetic analyses. The technique, thanks to the removal of the clock harmonics and some noise sources, allows efficiently disclosing the leaking information. It has been applied to three different modular exponentiation algorithms, mapped onto the same multiplexed architecture. The latter is able to perform the exponentiation with successive modular multiplications using the Montgomery method. Experimental results demonstrate the efficiency of the applied demodulation based technique and also point out the remaining weaknesses of the considered architecture to retrieve secret keys.